<template>
    <el-container class="home_container">
        <!-- 头部区域 -->
        <el-header>
            <div>
                <img src="../assets/shopping.webp" alt="">
                <span>电商后台管理系统</span>
            </div>
            <el-button type="info" @click="loginOut">退出</el-button>
        </el-header>
        <el-container>
            <!-- 侧边栏区域 -->
            <el-aside :width="isCollapse? '64px' : '200px'">
                <div class="toggle-button" @click="toggleCollapse">|||</div>
                <!-- 侧边栏菜单区域 -->
                <!-- router 表示为菜单栏开启 vue-router路由模式,启用该模式会在激活导航时以 index 作为 path 进行路由跳转 -->
                <el-menu background-color="#d3d1cd" text-color="#fff" active-text-color="#70bdcc" unique-opened :collapse="isCollapse" :collapse-transition="false" router :default-active="activePath">
                    <!-- 一级菜单 -->
                    <el-submenu :index="item.id + ''" v-for="item in menuList" :key="item.id">
                        <!-- 一级菜单的模板区域 -->
                        <template slot="title">
                            <!-- 图标 -->
                            <i :class="iconsObj[item.id]"></i>
                            <!-- 文本 -->
                            <span>{{item.authName}}</span>
                        </template>
                        <!-- 二级菜单 -->
                        <!-- 点击二级菜单，获取到相应的导航链接的状态，并存储在sessionStorage中，动态的绑定到default-active属性上 -->
                        <el-menu-item :index="'/'+subItem.path" v-for="subItem in item.children" :key="subItem.id" @click="saveNavState('/'+subItem.path)">
                            <template slot="title">
                                <!-- 图标 -->
                                <i class="el-icon-menu"></i>
                                <!-- 文本 -->
                                <span>{{subItem.authName}}</span>
                            </template>
                        </el-menu-item>
                    </el-submenu>

                </el-menu>
            </el-aside>
            <!-- 右侧内容主体区域 -->

            <el-main>
                <!-- 路由占位符 -->
                <router-view></router-view>
            </el-main>
        </el-container>
    </el-container>
</template>

<script>
export default {
    data() {
        return {
            // 左侧菜单数据
            menuList: [],
            // icons数组
            iconsObj: {
                125: "iconfont icon-user",
                103: "iconfont icon-tijikongjian",
                101: "iconfont icon-shangpin",
                102: "iconfont icon-danju",
                145: "iconfont icon-baobiao"
            },
            // 菜单是否折叠
            isCollapse: false,
            // 保存被激活的链接地址
            activePath: ""
        }
    },
    created() {
        this.getMenuList()
        this.activePath = window.sessionStorage.getItem("activePath")
    },
    methods: {
        // 退出登录的方法
        loginOut() {
            // 清空token,调用 window.sessionStorage.clear()方法
            window.sessionStorage.clear()
            // 跳转至登录页面
            this.$router.push("/login")
        },
        // 获取所有的菜单
        async getMenuList() {
            const { data: res } = await this.$http.get("menus")
            console.log(res)
            if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
            this.menuList = res.data
        },
        // 点击按钮，切换菜单的折叠与展开方法
        toggleCollapse() {
            this.isCollapse = !this.isCollapse
        },
        // 保存导航链接的激活状态
        saveNavState(activePath) {
            window.sessionStorage.setItem("activePath", activePath)
            this.activePath = activePath
        }
    }
}
</script>

<style lang="less" scoped>
.home_container {
    height: 100%;
}
.el-header {
    display: flex;
    justify-content: space-between;
    padding-left: 0;
    align-items: center;
    color: #fff;
    font-size: 20px;
    background-color: #70bdcc;
    > div {
        display: flex;
        align-items: center;
        img {
            width: 61px;
            height: 56px;
        }
        span {
            margin-left: 15px;
        }
    }
}
.el-aside {
    background-color: rgb(211, 209, 205);
    .el-menu {
        border-right: none;
    }
}
.el-main {
    background-color: rgba(250, 240, 240, 0.839);
}
.iconfont {
    margin-right: 10px;
}
.toggle-button {
    background-color: #909399;
    font-size: 10px;
    line-height: 24px;
    color: #fff;
    text-align: center;
    letter-spacing: 0.2em;
    cursor: pointer;
}
</style>